CN102532589A - Comprehensive recycling method of waste and old compact discs - Google Patents
Comprehensive recycling method of waste and old compact discs Download PDFInfo
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- CN102532589A CN102532589A CN2011104336450A CN201110433645A CN102532589A CN 102532589 A CN102532589 A CN 102532589A CN 2011104336450 A CN2011104336450 A CN 2011104336450A CN 201110433645 A CN201110433645 A CN 201110433645A CN 102532589 A CN102532589 A CN 102532589A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention relates to a comprehensive recycling method of waste and old compact discs. By carrying out the steps of polishing, acid and alkali solution soaking, alcohol solvent soaking, smashing, washing, chloroform or toluene soaking, solid precipitation and the like to the waste and old compact discs, precious metal, dye and polycarbonate in the waste and old compact discs are recycled. By means of the technical scheme, the waste and old compact discs are comprehensively utilized, useful materials in the waste and old compact discs are recycled, the recycling rate is high, and recycled products are good in purity. Besides, the comprehensive recycling method is simple in process and simple and convenient to operate, reduces energy consumption, saves cost, and is ideal.
Description
Technical field
The present invention relates to waste disk and reclaim the field, be specifically related to a kind of comprehensive recovering process that from waste disk, reclaims precious metal, dye well polycarbonate.
Background technology
It is reported that the whole world is annual can consumption Zhang Guangpan up to a million, in order to listen to the music, see a film, storage information etc.CD has not only enriched people's cultural life, also brings a lot of facilities to people.But how to dispose these waste disks, become the problem that lets the people scratch one's head.In the past, these waste disks are sent to the waste incineration field and destroy, and also some is buried in underground.But; CD and Other Waste have a great difference, and its composition of 90% is a polycarbonate, and this is a kind of good thermoplastic materials; And more absolutely recycling of the outer packaging of CD, how the research of comprehensive reutilization waste disk becomes an of great value direction.
The treatment process commonly used of present known recovery waste disk has three kinds:
1, supersonic method
In a particular reactor, pack into and contain the solution of tensio-active agent; Make on the CD body and must separate with body under the UW effect with protective membrane by metal level; Solution circulated is used, and clean matrix can continue to use as the sheet base, but higher to equipment and technical requirements.
2, chemical method
CD is immersed in the sodium hydroxide solution, is heated to that printed layers and resist will come off from body after the certain temperature, the aluminum tamper also can be dissolved, and treats but also will distinguish to different discs, make produce complicated.
3, mechanical process
Directly rub, grind printed layers tamper etc. from body with machinery, the simplest and organic efficiency is high, but body material resin easy to wear, to subsequent disposal inconvenience.
To a large amount of polycarbonate that contain in the CD, recovery method commonly used is successively through pulverizing, soda boiling, cleaning, picking, cleaning, drying, wire drawing, plastotype with waste disk.Clean up after aforesaid method is pulverized waste disk and reproduce the grain use; But fragment has lost the CD form, is difficult to remove non-layer of polycarbonate such as tamper, and the polycarbonate quality of acquisition can differ from many; Thereby influence the content of polycarbonate; Be not suitable for the following process production of high-end product, each metalloid is discharged with waste liquid and also can be polluted environment in the waste liquid, also is the waste to resource.
Summary of the invention
The defective that waste disk can not get effectively in the prior art in order to overcome, synthetically recycle the purpose of this invention is to provide a kind of comprehensive recovering process of waste disk.
The comprehensive recovering process of waste disk provided by the invention may further comprise the steps:
(1) the waste disk polishing is removed scalping and obtain the disc plate base;
(2) the disc plate base is adopted the dipping by lye 15～30 minutes of mass percent 15～30%, cross and filter the alkali soak solution that contains precious metal;
(3) the disc plate base after step (2) is handled soaked 10～20 minutes with alcoholic solvent, and the soak solution lucifuge concentrates and reclaims dyestuff;
(4) it is the particle below the 3mm that the disc plate original washing powder after step (3) is handled is broken into diameter, uses clear water to be washed till said particle surface and is neutrality, adopts chloroform or toluene to soak then 30～60 minutes, crosses and filters clear liquid;
(5) add ETHYLE ACETATE or ethanol to step (4) gained clear liquid, separate out the polycarbonate solid, filtration, dried recovered polycarbonate.
The said upper layer of step (1) comprises printed layers, resist and the tamper of optical disc surface.
Preferably, said recovery method also comprises: the described upper layer of step (1) is collected, adopted the acid solution of mass concentration 3～10% to soak 10～12 hours down at 40～60 ℃ then, must contain the soak liquid of precious metal.
Said acid solution is nitric acid, hydrochloric acid or sulphuric acid soln, and the quality of acid solution is 1～3 times of upper layer quality.
The said alkali lye of step (2) is sodium hydroxide or potassium hydroxide solution, and the quality of alkali lye is 1～3 times of disc plate matrix amount.
In the said dipping by lye process of step (2) said alkali lye is heated to 30～50 ℃.
The said alcoholic solvent of step (3) is methyl alcohol, ethanol, Virahol or propyl carbinol, and the quality of alcoholic solvent is 1～3 times of disc plate matrix amount.
Temperature is controlled to be 50～70 ℃ in the said lucifuge concentration process of step (3).
The quality of said chloroform of step (4) or toluene is 3～5 times of said granular mass, is heated to 30～60 ℃ in the immersion process.
Said ETHYLE ACETATE of step (5) or alcoholic acid volume are 0.8～1.2 times of said clear liquid.
Said comprehensive recovering process is before carrying out, and the metal species that can contain according to CD is earlier carried out manual work and classified in advance, and then reclaims precious metal, dyestuff, polycarbonate etc. step by step according to above-mentioned recovery method.
In the said comprehensive recovering process, step (1) can be removed the upper layer of the overwhelming majority through mechanical grinding.The dipping by lye of step (2) can further be removed residual a small amount of upper layer; And can clean completely the disc plate base, make the dyestuff of subsequent recovery and polycarbonate purity better, therefore; The concentration of alkali lye and the time of immersion are particularly important; Control and bad the disc plate base jaundice that obtains is become fragile, and then have influence on the purity that reclaims polycarbonate, make the polycarbonate purity of recovery cross low and can't utilize again.
Soak liquid that said comprehensive recovering process obtains and alkali soak solution can directly sell as a kind of solution commodity that contain metal, and existing at present numerous smelteries directly buy the refinement that is used for precious metal; Also can carry out concentrated extract according to traditional metal smelting method, refine like wet method, the bullion content that obtains after the refinement can be up to 99%.
Dyestuff in the step (3) is the common cyanine of optical disc surface layer, phthalein green grass or young crops and azo dyes, and different types of dyestuff can adopt technical scheme of the present invention to reclaim.
Technical scheme according to the invention has following advantage:
1, waste disk has been carried out omnibearing comprehensive utilization, wherein metal (like gold and silver etc.), dyestuff and polycarbonate are all reclaimed, the recovery is high, has effectively utilized waste, has reduced environmental stress.
2, the method for the invention not only can be extracted the useful matter in the waste disk, and the good product purity that reclaims, and meets the requirement that utilizes again.
3, the operation in the method for the invention is simple, easy and simple to handle, has practiced thrift energy consumption and cost, is the method for the comprehensive recycling of a kind of ideal waste disk, the suitable large-scale application of carrying out.
Description of drawings
Fig. 1 is the process flow sheet of waste disk comprehensive recovering process according to the invention.
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Embodiment 1
(1), waste and old DVD CD is ground off printed layers, resist and the tamper etc. on surface in closed environment with mechanical grinding roller polishing; Dust that collection grinds off and solid residue; Using massfraction is that 5% salpeter solution soaked 12 hours, and the quality of salpeter solution is dust and solid residue quality 2.5 times, is heated to about 50 ℃ in the immersion process; Residue filters, and the soak liquid that contains precious metal directly obtains precious metal wherein as commodity selling or through conventional process for extracting.
(2), grinding off disc plate base behind the upper layer, to be positioned over the quality percentage composition be to soak in 20% the sodium hydroxide solution, the quality of sodium hydroxide solution is 3 times of disc plate base, soak solution is heated to about 50 ℃; Soak time was controlled at 20 minutes, took out the disc plate base then, used clear water drip washing; Dry; Disc plate primary surface metal level is removed fully, and non-yellowing, still keep toughness.The soaking with sodium hydroxide liquid that contains noble metal directly obtains precious metal wherein as commodity selling or through conventional process for extracting.The precious metal recovery of step (1) and (2) by conventional DVD optical disc surface layer metal content greater than 95%.
(3) the disc plate base after above-mentioned steps is handled soaks with ethanol about 10 minutes with dissolving dyestuff wherein; The alcoholic acid quality is 2.5 times of compact disc substrate, then the sheet base is taken out, and the ethanolic soln of gained is concentrated in the environment of dark with the acquisition dyestuff; In the concentration process for preventing that dyestuff from decomposing; Temperature is controlled at about 50 ℃, and greater than 95%, purity is greater than 99% (conventional H PLC detection) by conventional DVD optical disc surface layer dyestuff content for the recovery of dyestuff.
(4) broken through the disc plate original washing powder after the alcohol immersion is the particle of diameter below 3 millimeters; Using clear water to wash with the residual alkali lye of flush away repeatedly is neutrality until the surface; Sheet base after will pulverizing with 1: 3 mass ratio then is dissolved in the chloroform, in the about 40 ℃ water-bath of temperature, soaks 60 minutes, forms armorphous polycarbonate solution; Pass through wherein insolubles of filtration or centrifugal removal then, obtain clarifying polycarbonate solution.
(5) in the polycarbonate solution of above-mentioned steps gained, add isopyknic ETHYLE ACETATE, separate out the polycarbonate solid in the solution gradually, filter or centrifugal collection polycarbonate solid.The polycarbonate solid that collection is obtained continues to be dissolved in the chloroform, adds ETHYLE ACETATE again it is separated out, and repeats twice of this operation; Then the polycarbonate that obtains is washed; 90 ℃ of following vacuum-dryings, obtain colorless transparent polycarbonate, in the sheet matrix amount after the alcohol immersion; The recovery of polycarbonate is greater than 90%, and purity is greater than 95% (conventional H PLC detection).
Embodiment 2
(1), waste and old CD-R CD is ground off printed layers, resist and the tamper etc. on surface in closed environment with mechanical grinding roller polishing; Dust that collection grinds off and solid residue; Using massfraction is that 8% sulphuric acid soln soaked 10 hours, and the quality of sulphuric acid soln is dust and solid residue quality 1.5 times, is heated to about 60 ℃ in the immersion process; Residue filters, and the soak liquid that contains precious metal directly obtains precious metal wherein as commodity selling or through conventional process for extracting.
(2), grinding off disc plate base behind the upper layer, to be positioned over the quality percentage composition be to soak in 25% the potassium hydroxide solution, the quality of potassium hydroxide solution is 2 times of disc plate base, soak solution is heated to about 40 ℃; Soak time was controlled at 15 minutes, took out the disc plate base then, used clear water drip washing; Dry; Disc plate primary surface metal level is removed fully, and non-yellowing, still keep toughness.The alkali soak solution that contains noble metal directly obtains metal wherein as commodity selling or through conventional process for extracting.The precious metal recovery of step (1) and (2) by conventional CD-R optical disc surface layer metal content greater than 95%.
(3) the disc plate base after above-mentioned steps is handled soaks with methyl alcohol about 15 minutes with dissolving dyestuff wherein; The quality of methyl alcohol is 3 times of compact disc substrate, then the sheet base is taken out, and the methanol solution of gained is concentrated in the environment of dark with the acquisition dyestuff; In the concentration process for preventing that dyestuff from decomposing; Temperature is controlled at about 70 ℃, and greater than 95%, purity is greater than 99% (conventional H PLC detection) by conventional CD-R optical disc surface layer dyestuff content for the recovery of dyestuff.
(4) broken through the disc plate original washing powder after the methyl alcohol immersion is the particle of diameter below 3 millimeters; Using clear water to wash with the residual alkali lye of flush away repeatedly is neutrality until the surface; Sheet base after will pulverizing with 1: 3 mass ratio then is dissolved in the toluene, in the about 60 ℃ water-bath of temperature, soaks 40 minutes, forms armorphous polycarbonate solution; Pass through wherein insolubles of filtration or centrifugal removal then, obtain clarifying polycarbonate solution.
(5) in the polycarbonate solution of above-mentioned steps gained, add isopyknic ETHYLE ACETATE, separate out the polycarbonate solid in the solution gradually, filter or centrifugal collection polycarbonate solid.The polycarbonate solid that collection is obtained continues to be dissolved in the toluene, adds ETHYLE ACETATE again it is separated out, and repeats this operation three times; Then the polycarbonate that obtains is washed; 90 ℃ of following vacuum-dryings, obtain colorless transparent polycarbonate, the sheet matrix amount after soaking in methyl alcohol; The recovery of polycarbonate is greater than 90%, and purity is greater than 95% (conventional H PLC detection).
Embodiment 3
(1), waste and old DVD CD is ground off printed layers, resist and the tamper etc. on surface in closed environment with mechanical grinding roller polishing; Dust that collection grinds off and solid residue; Using massfraction is that 10% hydrochloric acid soln soaked 12 hours, and the quality of hydrochloric acid soln is dust and solid residue quality 2 times, is heated to about 60 ℃ in the immersion process; Residue filters, and the soak liquid that contains precious metal directly obtains precious metal wherein as commodity selling or through conventional process for extracting.
(2), grinding off disc plate base behind the upper layer, to be positioned over the quality percentage composition be to soak in 25% the sodium hydroxide solution, the quality of sodium hydroxide solution is 1.5 times of disc plate base, soak solution is heated to about 35 ℃; Soak time was controlled at 25 minutes, took out the disc plate base then, used clear water drip washing; Dry; Disc plate primary surface metal level is removed fully, and non-yellowing, still keep toughness.The soaking with sodium hydroxide liquid that contains noble metal directly obtains precious metal wherein as commodity selling or through conventional process for extracting.The precious metal recovery of step (1) and (2) by conventional DVD optical disc surface layer metal content greater than 95%.
(3) the disc plate base after above-mentioned steps is handled soaks with ethanol about 20 minutes with dissolving dyestuff wherein; The alcoholic acid quality is 1.5 times of compact disc substrate, then the sheet base is taken out, and the ethanolic soln that is obtained is concentrated in the environment of dark to obtain dyestuff; In the concentration process for preventing that dyestuff from decomposing; Temperature is controlled at about 60 ℃, and greater than 95%, purity is greater than 99% (conventional H PLC detection) by conventional DVD optical disc surface layer dyestuff content for the recovery of dyestuff.
(4) broken through the disc plate original washing powder after the alcohol immersion is the particle of diameter below 3 millimeters; Using clear water to wash with the residual alkali lye of flush away repeatedly is neutrality until the surface; Sheet base after will pulverizing with 1: 5 mass ratio then is dissolved in the toluene, in the about 50 ℃ water-bath of temperature, soaks 50 minutes, forms armorphous polycarbonate solution; Pass through wherein insolubles of filtration or centrifugal removal then, obtain clarifying polycarbonate solution.
(5) in the polycarbonate solution of above-mentioned steps gained, add 0.8 times of volume of ethanol, separate out the polycarbonate solid in the solution gradually, filter or centrifugal collection polycarbonate solid.The polycarbonate solid that collection is obtained continues to be dissolved in the toluene, adds ethanol again it is separated out, and repeats twice of this operation; Then the polycarbonate that obtains is washed; 80 ℃ of following vacuum-dryings, obtain colorless transparent polycarbonate, in the sheet matrix amount after the alcohol immersion; The recovery of polycarbonate is greater than 90%, and purity is greater than 95% (conventional H PLC detection).
Comparative Examples
With dipping by lye time lengthening to 40 minute, all the other steps are with embodiment 1.
The obvious flavescence of disc plate base behind the dipping by lye, and easy crisp, the polycarbonate yield that subsequent process obtains after handling is lower than 70%, and purity is lower than 90%, can't continue to utilize.
Though, the present invention has been done detailed description in the preceding text with general explanation and specific embodiments, on basis of the present invention, can to some modifications of do or improvement, this will be apparent to those skilled in the art.Therefore, these modifications or the improvement on the basis of not departing from spirit of the present invention, made all belong to the scope that requirement of the present invention is protected.
Claims (10)
1. the comprehensive recovering process of a waste disk is characterized in that, may further comprise the steps:
(1) the waste disk polishing is removed scalping and obtain the disc plate base;
(2) the disc plate base is adopted the dipping by lye 15～30 minutes of mass percent 15～30%, cross and filter the alkali soak solution that contains precious metal;
(3) the disc plate base after step (2) is handled soaked 10～20 minutes with alcoholic solvent, and the soak solution lucifuge concentrates and reclaims dyestuff;
(4) it is the particle below the 3mm that the disc plate original washing powder after step (3) is handled is broken into diameter, uses clear water to be washed till said particle surface and is neutrality, adopts chloroform or toluene to soak then 30～60 minutes, crosses and filters clear liquid;
(5) add ETHYLE ACETATE or ethanol to step (4) gained clear liquid, separate out the polycarbonate solid, filtration, dried recovered polycarbonate.
2. recovery method according to claim 1 is characterized in that, the said upper layer of step (1) comprises printed layers, resist and the tamper of optical disc surface.
3. recovery method according to claim 1 and 2; It is characterized in that; Said recovery method also comprises: the described upper layer of step (1) is collected, adopted the acid solution of mass concentration 3～10% to soak 10～12 hours down at 40～60 ℃ then, must contain the soak liquid of precious metal.
4. recovery method according to claim 3 is characterized in that, said acid solution is nitric acid, hydrochloric acid or sulphuric acid soln, and the quality of acid solution is 1～3 times of upper layer quality.
5. recovery method according to claim 1 is characterized in that, the said alkali lye of step (2) is sodium hydroxide or potassium hydroxide solution, and the quality of alkali lye is 1～3 times of disc plate matrix amount.
6. recovery method according to claim 5 is characterized in that, in the said dipping by lye process of step (2) said alkali lye is heated to 30～50 ℃.
7. recovery method according to claim 1 is characterized in that, the said alcoholic solvent of step (3) is methyl alcohol, ethanol, Virahol or propyl carbinol, and the quality of alcoholic solvent is 1～3 times of disc plate matrix amount.
8. recovery method according to claim 7 is characterized in that, temperature is controlled to be 50～70 ℃ in the said lucifuge concentration process of step (3).
9. recovery method according to claim 1 is characterized in that, the quality of said chloroform of step (4) or toluene is 3～5 times of said granular mass, is heated to 30～60 ℃ in the immersion process.
10. recovery method according to claim 1 is characterized in that, said ETHYLE ACETATE of step (5) or alcoholic acid volume are 0.8～1.2 times of said clear liquid.
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| CN2011104336450A CN102532589B (en) | 2011-12-21 | 2011-12-21 | Comprehensive recycling method of waste and old compact discs |
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| CN2011104336450A CN102532589B (en) | 2011-12-21 | 2011-12-21 | Comprehensive recycling method of waste and old compact discs |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103937187A (en) * | 2014-04-21 | 2014-07-23 | 浙江理工大学 | Cellulose nanocrystal enhanced flexible nanocomposite film made of polycarbonate extracted from waste optical disc and preparation method of flexible nanocomposite film |
| CN104762477A (en) * | 2014-01-08 | 2015-07-08 | 陈怡雯 | Silver component-containing waste recovery treatment method |
| TWI498429B (en) * | 2013-12-19 | 2015-09-01 | ||
| CN114008010A (en) * | 2019-06-19 | 2022-02-01 | 高新特殊工程塑料全球技术有限公司 | Isolation of bisphenol A by depolymerization of poly (carbonate) |
| CN114044867A (en) * | 2021-12-07 | 2022-02-15 | 西南石油大学 | Method for preparing benzoxazine resin based on waste optical disk |
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2011
- 2011-12-21 CN CN2011104336450A patent/CN102532589B/en not_active Expired - Fee Related
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI498429B (en) * | 2013-12-19 | 2015-09-01 | ||
| CN104762477A (en) * | 2014-01-08 | 2015-07-08 | 陈怡雯 | Silver component-containing waste recovery treatment method |
| CN103937187A (en) * | 2014-04-21 | 2014-07-23 | 浙江理工大学 | Cellulose nanocrystal enhanced flexible nanocomposite film made of polycarbonate extracted from waste optical disc and preparation method of flexible nanocomposite film |
| CN103937187B (en) * | 2014-04-21 | 2015-12-02 | 浙江理工大学 | A kind of Cellulose nanocrystal strengthens abandoned optical discs and extracts flexible nano composite membrane of polycarbonate and preparation method thereof |
| CN114008010A (en) * | 2019-06-19 | 2022-02-01 | 高新特殊工程塑料全球技术有限公司 | Isolation of bisphenol A by depolymerization of poly (carbonate) |
| CN114044867A (en) * | 2021-12-07 | 2022-02-15 | 西南石油大学 | Method for preparing benzoxazine resin based on waste optical disk |
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